Precision controlled finishing and sizing device



n. 1951 c. M. WATTS 2,536,479

PRECISION CONTROLLED FINISHING AND SIZING DEVICE Filed Dec. 6, 1945 2 Sheets-Sheet l jaw 34 34 35 35 3Z .-Z(9 Z5 1 I .1 o

2'2! Z5 v N Z/ 56 I Z0 Z4 5? l|| WW! w /5 HI |l||| IN VEN TOR.

Ja m Z, 1951 c. M. WATTS 2,536,479

PRECISION CONTROLLED FINISHING AND SIZING DEVICE Filed Dec. 6, 1945 2 Sheets-Sheet 2 I 54 I 3 I 2 2'9: :5, 34

INVENTOR.

Patented Jan. 2, 1951 UNITED STATES PATENT OFFICE PREGISION CGNTROLLED FINESHENG AND SIZING DEVICE vilharlcs Marion Watts, Elkhart, Ind.

Application December-6, 1945, Serial No. 633,163

dimension while the device is controlled by an adjustable 'stop preventing 'ove'rrunning of the desired dimension.

Another object of the inventionisthe provision of a device that will accurately produce the predetermined dimension to .00'0020 inch tolerance;

Another object of 'theinvention is the provi sion of a device of the class described when equipped with an electronic gage which will indicate at all'times the diameter of the work as finishingis in progress;

Still another obj'ect of the invention is the provision of a'deviceu'sing opposed 'abrasi've erementstocorrect' cuter round surfaces which Figure 3'is a section similar to Figure 2 of -a device for internal work only.

Inthe drawings in which like characters of reference designate like-or similar parts, Figures lfandZ illustratea device embodying my 111- vention and fitted for external work only. Numcram denotes a member by which the device is" mounted toth'e; quill of any genera-l pdr pose finishing machine which has facilities for revolvin'g the work piece, oscillating 'and"travers'- mea abrasive agent-as a method of finishing and sizing; r

The t-ass member 2 isprovid'edin each front corner with an opening in-which 'a'sleeve '4 is held by a setf'screw 5 threaded into" the front face of Lthe base an'di'e itending through sleeve .c and capted bear'tti'th its inner and against 2 astem 8. In each sleeveis slidably disposed a stem 8 which terminates at its lower endin a head 9. A bridge member it has an aperture,

at either end for one of the stems to which-it is fixed, and restsupon the heads. An abra sive holder 12 is attached by fasteners lite-the intermediate portion of the upper surface of the bridge memberand holds an abrasive agent-"or stone hi which has at its upper end a concave operative surface.

The upper ends of the sleeves project-above the top surface of the base and are each surrounded by the lower turns of a coil spring I76, Each Spring also encircles the upper end portion of the stem slidably disposed in the sleeve and bears with itsupper end against the under side of an upper bridge member ll. The same hasvertical openings in either end each for the upper end portion of a plunger 8 which is adjustably secured to the upper bridge member by a lock screw l8:

The intermediate portion 29 of the upper bridge member is thickened on either vertical side and has an upwardly extending threaded stem 2! upon which a nut '22 is threaded; The nut is held in adjusted position by the vertical leaf spring 23 which is attached by its horizontal part and a fastener 25 to the'top'surface of the per end a compressive coil spring 3Elhoused in the sleeve. This spring bears with its upper end against a collar 31 affixedto the lower re duced end of a screw 32 Whichmay be displaced in a nut 34. The nut is fixed by a pin 35 in the upper end'of the sleeve and also e-ngagedby a lock nut 36.

The rod 26 is diametrally apertured near; its

upper end for the insertion of a pin 38 which extends considerably beyond either side of the roc1, and issecured in the lower ends-of a pair of links 49. pivoted to the free end of a leg ll of a Li-shaped lever 42. The legs of the lever are -eaTch,fu1-. crumed at an intermediate point upon a pin 43.

These pins extend from opposite sides of a clamp 44 which is clamped by screw lii'upon the spring sleeve.

The lower portion of the sleeve is provided with i a pair of registering slots 46 in which the end portions of pin 38 projecting beyondthe :rodare slidably disposed. The springslee've extendsiinto The upper end of either link is an annular space formed in the enlarged intermediate part of the upper bridge member and surrounding the rod. The rod 26 passes through a central vertical aperture in the intermediate part of the upper bridge member. The rod has below and coplanar with the opening for the pin 38 described another opening for a pin 4'! the end portions of which extend outwardly on either side of the rod and may be engaged on their lower sides by the upper end of the nut 22 described.

The rod extends below the intermediate and enlarged portion of the upper bridge member and has a reduced lower end 38 extending into a central socket formed in the intermediate portion of the upper end of a support 49 which is slidably disposed in an aperture in the base and may be secured therein by a screw 50. A pin 51 connects the lower end of the rod to the support. To the 7 lower end of the support is attached by fasteners I3 a holder 52 which extends laterally beyond the front and rear sides of the support and holds on its lower side an abrasive agent or stone 54 To the upper bridge member is attached by screw 51 an adjustable actuating plunger 56 to be attached to any standard electronic measuring instrument.

"The device can be used with or without the electronic measuring device which saves the time otherwise spent in removing the work piece from the machine for repeated checking.

The compression springs I6 between the upper bridge member and the base support the upper bridge I! and the parts carried thereby resiliently so that their weight is not added to the pressure applied to the upper stone; These springs also carry the'same weight when the stone is retracted from the work piece. Both abrasive agents may be positioned at a predetermined distance from the work piece by the setting of the screws !8.

Assuming that the set screws l8 are advanced for clamping the stems 8 to the upper bridge ll. that the set screws are retracted so that the stems 8 can slide relatively to the sleeves 4 and to the base 2, and also that the set screw 50 is retracted, as seen in Figure '2. so'that the support 49 can slide through the base 2, to operate the device as illustrated in Figures 1 and 2, the ad justing nut 22 is rotated in a direction for causing it to move downwardly on the threaded porwill draw the stems 8 upwardly through the sleeves 4 and base 2 for moving the lower bridge In and lower abrasive element 84 upwardly with respect to the fixed support 2 so as to move said abrasive element It also into engagement with the rotating work piece W, so that both of said abrasive elements [4 and 54 will yieldably engage the work piece in opposed, relationship to one another. This movement of the parts, as pre viously described, will cause the stop pin 41 and the nut 22 to approach one another and the spacing left therebetween after the abrasive elements are in engagement with the work piece will regulate the extent of the abrading operation on tion 2| and out of engagement with the stop pin 7 41. The lever 42 is then swun in a counterclockwise direction as seen in Figure 1- so that the pivot of the lever 42 to the links 45! will cross the dead center of the pivots.38 and 43 to thereby release the parts so that the expansion spring 30 can expand. One end of the spring 352 seats againstthe collar 3! which is fixedly disposed relatively to the sleeve 28 by the parts 32, 34 and 35 whereas the opposite end of the spring seats against the upper end of the shank 26 for there' is slidable through the base 2 and the shank 25 is slidable in the sleeve 28 and the upper bridge 11; The upward movement of the sleeve 28 in response to the urgency of the sprin 39 will at V theisame time carry the upper bridge I? up wardly'with said sleeve 28, dueto the fact that thelowerend thereof is secured in the stem 21 of the bridge H. The bridge I! in moving upwardly the work piece, since when the stop pin 4? engages the nut 22 the abrading elements will thereafter be prevented from moving further toward one another. The springs It function merely to support the upper bridge ii and the parts carried thereby so that the operating spring 3d may act uniformly on the abrasive elements wand 54, as previously described, for yieldably holding each with the same amount of tension in engagement with the work piece.

The set screws 5 and iii] are utilized for locking the stems 8 and the support 49, respectively, when the lever 42 is in its position of Figure 1 for retaining the abrasive elements It and 54 in their retracted positions of Figures 1 and 2 and out'of engagement with the work piece so that the abrasive elements may be brought into contact with a diamond truing bar, not shown,-when oliamond truing of the abrasive agents is required. Figure 3 illustrates a slightly modified embodiment of the device intended for use for internal abrading and which is so analogousin construction to the embodiment, previously described and illustrated in Figures 1 and 2, that the modification has been illustrated only by a vertical sectional view, similar to Figure 2, and the parts of the device of Figure 3 which correspond or substantially correspond to the preferred embodiment of Figures 1 and 2 have been designated with a corresponding reference character except that the reference charactersof the modification are primed. Accordingly, the fixed support is shown at 2' and one of the stems 8' is shown supporting the lower bridge 10f which rests upon the head 9 of said stem. An abrasive holder i2 is supported by the bridge NJ for mountin an abrasive element I4 on the underside'thereof and in laterally offset relationship to the bridge Ill. The upper bridge I1 is yieldably supported above the supporting base 2' by springs i6, one of which is shown in Figure 3 and'said bridge is provided with a laterally thickened central portion having an upstanding externally threaded extension 2|. A rod or shank 26' extends re-" ciprocally through a'bore of said thickened portion 20' and through its extension 2| and loosely through a nut 22 which adjustablyand threadedly engages the extension 2l. The lower end of the sleeve 28' is anchored in a recess of the;

extension 2i to slidably receive the upper-end; of the rod 26' and said sleeve is ovided with longitudinal slots 4% to slidably receive a stoppin 41' which extends diametrically through the 7 rod 26' and outwardly through said slots 46; A bolt or pin 38 extends through the rod 26' and has its ends projecting outwardly through the 51011546 and each of said ends pivotally engage an end of one of a pair of links 48' the opposite ends of which are pivotally connected to the free ends of the legs 4| of a U-shaped lever 12; The legs 4| adjacent said free ends, are pivotally absence connected to *an a'd'justable clamp "13 its pivot pins 43 T :An adjusting screw 32 lisad-Justably disposed inz'the upper end of the sleeve 28' by-engagement with the threaded bore of a :nut 3d which is-securedin the upper end of said sleeveby a retaining pin 35, said adjusting screw being equipped with a lock nut 36, adapted to bear against the outer end of the nut 34'. Ther'spring 30, contained in the sleeve-28' constitutes a contractiletcoil'sprin in counter distinction to the expansion: coil spring 39 of the embodiment of Figures land 2, and the upperlen'd- 'of saidsprin'g is suitablysecured to the lower end of the screw 32f, .whereasethe opposite end of the spring 36' .is fastened to the upper end of the rod '26 by a headed screw 64.

A support orshank'dfl' is reciprocally disposed in the base 2' and may besecured relatively thereto bya set. screwed which'is normall retracted when the device is in use. The rod 2% has a restricted lower end 48' which extends into a socket in the upper end of the support 49 and which is connected thereto by a pin 5!. An abrasive support 52, corresponding to the sup-- port I2 is secured to the lower end of the support 49' and mounts an abrasive element 54' on the upper side thereof and in substantially the same vertical plane as the abrasive element I i.

The nut 22 is provided with diametrically opposed openings 60' through which the pin cl may be applied to or removed from the rod 25" and said pin is of a length to move longitudinally within the recess of the nut 22' between the extension 2| and an annular restriction 52 of the nut 22'.

The abrasive elements I4 and 5 are adapted to be positioned in the cylindrical bore of a work piece W and, assuming the set screw 58' to be backed off and the stem 8' to be reciprocally disposed relatively to the base 2' and secured to the upper bridge H, by swinging the lever 42' in a direction away from the operator, as seen in Fig ure 3, said lever will be rocked on its pivot 43 for causing the pivotal connection of the links All and legs 4| to cross the dead center of the pivots 38 and 43 to release the spring so so that it can urge the rod 26 upwardly and the sleeve 28 downwardly thereby to move the support 49 and support 52' upwardl toward the fixed base 2' for moving the abrasive element 54' into engage ment with the bore of the work piece W and at the same time the sleeve 28' in being drawn downwardly will force the bridge ll downwardly toward the base 2 to cause the stems 8' to slide downwardly therethrough carryin the lower bridge l0 and support l2 for moving the abrasive element 14' likewise into engagement with the bore of the work piece. This will cause the pin 41' to move toward the stop flange 62 and when said parts engage further movement of the abrasive elements l4 and 54' away from one another under the biasing action of the spring 39' will be prevented. Thus, the pins 4'! and the flange 62 of the nut 22 afford the positive stop for the embodiment of Figure 3 to limit the extent of the abrasive operation on the bore of the work piece. As in the previous embodiment, the springs l6 merely counterbalance the weight of the upper bridge l1 and the parts supported thereby so that both abrasive elements will engage the work with the same amount of pressure.

Various modifications and changes are contemplated and may obviously be resorted to, with out departing from the spirit or scope of the inell 6. vention as hereinafter defined by-th'e' appended claims.

What I claim and'des'ire-to protect-bylietters Patent is:

1. An abrasive devicecomprising a fixedsupport, an elongated frame, means connecting the frame to'th'e support for reciprocating movement of' the frame in the support in directions longitudinally of the-frame; a 'first' abrasive element connected to and-supported bythe irame and disposed transversely thereof, an abrasive support extending reciprocally through said fixed sup port and through apart of the frameand dis posed for reciprocating movement relatively to the fixed support 'and frame in directions 1ongitudinally of the frame, a second abrasive element secured to one-end ofthe' abrasive support disposed within the frame in opposed relationship to the first abrasive element forcooperation therewith, said abrasive elements being adapted to receive a workpiece therebetween which extends into the frame at a right angle to its longitudinal axis, a sleeve forming an extension of one end of the frame in which the other end of the abrasive support is reciprocally disposed and guided, an expansion spring disposed in said sleeve having one end abutting against said last mentioned end of the abrasive support, and said sleeve having a stop adjustably connected thereto against which the opposite end of said expansion spring abuts for yielclably urging the abrasive elements in opposite directions and toward one another.

2. A device as in claim 1, a link pivotally connected to the abrasive support, and a lever pivotally connected to said sleeve and having one end pivotally connected to the link in spaced relationship to its first mentioned pivot and forming a mechanical connection between the frame and abrasive support, said lever being swingable in one direction to exert a pull on the link to move the abrasive support in a direction for retracting the second abrasive element away from the first abrasive element and for moving the link across the pivot point of the lever for latching the abrasive support in a retracted position.

3. A device as in claim 1, a stop pin extending transversely through a part of the abrasive support, said frame having a transverse portion through which the abrasive support slidably extends, and a threaded collar connected to said transverse portion and adjustable thereon longitudinally of the abrasive support and disposed in the path of movement of the stop pin when the abrasive support is displaced toward said first abrasive element for limiting the extent of movement of the abrasive support and second abrasive element toward said first abrasive element.

4. A device as in claim 1, a link pivotally connected to the abrasive support, a lever pivotally connected to said sleeve and having one end pivotally connected to the link in spaced relationship to its first mentioned pivot and forming a mechanical connection between the frame and abrasive support, said lever being swingable in one direction to exert a pull on the link to move the abrasive support in a direction for retracting the second abrasive element away from the first abrasive element and for moving the link across the pivot point of the lever for latching the abrasive support in a retracted position, a stop pin extending transversely through a part of the abrasive support, said frame having a transverse portion through which the abrasive support slidably extends, and a threaded collar connected to said transverse portion and adjustable thereon longitudinally of the abrasive support and disposed in the path of movement of the stop pin when the abrasive support is displaced toward said first abrasive element for limiting the extent of movement of the abrasive support and second abrasive element toward said first abrasive element.

5. A device as in claim 1, said frame being .disposed with its longitudinal axis in a vertical plane and with said abrasive elements in vertically spaced relationship, and spring means engaging on the fixed support and bearing against a part of the frame disposed thereabove and yieldably supporting the frame relatively to the fixed support to counterbalance the weight of the frame and parts supported thereby.

CHARLES MARION WATTS.

. REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS" Number Number 20 7 254,259 

